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Which polyatomic ion is found in the compound represented by the formula NaHCO3?
(1) acetate (3) hydrogen sulfate

(2) hydrogen carbonate (4) oxalate

Sagot :

Ishankahpsidn

Answer is (2) - hydrogen carbonate


Explanation:


NaHCO₃ is an ionic compound which is made from Na⁺ and HCO₃⁻ ions. The decomposition is

NaHCO₃ → Na⁺ + HCO₃⁻


Among the resulted ions, Na⁺ is a monatomic ion while HCO₃⁻ is a polyatomic ion.


Polyatomic ions mean ions which are made of two or more different atoms.


HCO₃⁻ is made from 3 atoms as H, C and O. The name of HCO₃⁻ ion is bicarbonate or hydrogen carbonate.

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